Update index.js

invalid path to css

Author: tszpinda

index.js

@@ -8,6 +8,6 @@ module.exports = {
     this._super.included(app);
 
     app.import(app.bowerDirectory + '/bootstrap-datepicker/js/bootstrap-datepicker.js');
-    app.import(app.bowerDirectory + '/bootstrap-datepicker/css/datepicker.css');
+    app.import(app.bowerDirectory + '/bootstrap-datepicker/dist/css/bootstrap-datepicker.css');
   }
 };